Dustley Mulder signed a 2-year contract until 2012 on a free transfer at Bulgarian giants Levski Sofia. His contract at RKC Waalwijk expired in the summer of 2010 after relegation of the Dutch club. At the end of the 2011-12 season, the extension option in his contract was used and Mulder is now until June 2013 under contract.

In January 2013 Mulder extended his contract for another time. He is now under contract until June 2015 at the Bulgarian club. In July 2014, Mulder left Bulgaria and signed a 1 year contract with Cypriot club Apollon Limassol.

In July 2015 Mulder moved back to The Netherlands and signed a one-year deal at NAC Breda, the club that was just relegated from the highest level. In July 2016 he became available as free agent.